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# Is x-y+1 greater than x+y-1 ?

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Is x-y+1 greater than x+y-1 ? [#permalink]

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30 Sep 2010, 22:11
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Is x-y+1 greater than x+y-1 ?

(1) x > 0
(2) y < 0
[Reveal] Spoiler: OA

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Re: Is x-y+1 greater than x+y-1 ? [#permalink]

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30 Sep 2010, 22:25
Michmax3 wrote:
Is x-y+1 greater than x+y-1

1) x>0
2) y<0

Is x-y+1 > x+y-1

1-y > y-1 => This is possible only if y is negative.

Hence B is sufficient.
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Re: Is x-y+1 greater than x+y-1 ? [#permalink]

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30 Sep 2010, 22:32
Michmax3 wrote:
Is x-y+1 greater than x+y-1

1) x>0
2) y<0

x-y+1 > x+y-1
1-y > y-1
2y < 2
y < 1

1) does not talk about x. Insufficient
2) implies y<1.
Sufficient

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Re: Is x-y+1 greater than x+y-1 ? [#permalink]

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01 Oct 2010, 08:46
shrouded1 wrote:
Michmax3 wrote:
Is x-y+1 greater than x+y-1

1) x>0
2) y<0

x-y+1 > x+y-1
1-y > y-1
2y < 2
y < 1

1) does not talk about x. Insufficient
2) implies y<1.
Sufficient

Morning!

I'm just beginning to study for the GMAT and have a very weak quant background. I answered this question correctly but it took me 5 minutes to do so. I need to find ways to save time, could you explain to me why you noted that "1) does not talk about x. Insufficient" ? It seems like you removed choice A quickly.

This is probably a terribly novice question but I'm a novice so, I hope you don't mind!

Cheers,
f
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Re: Is x-y+1 greater than x+y-1 ? [#permalink]

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01 Oct 2010, 09:10
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fronds wrote:
shrouded1 wrote:
Michmax3 wrote:
Is x-y+1 greater than x+y-1

1) x>0
2) y<0

x-y+1 > x+y-1
1-y > y-1
2y < 2
y < 1

1) does not talk about x. Insufficient
2) implies y<1.
Sufficient

Morning!

I'm just beginning to study for the GMAT and have a very weak quant background. I answered this question correctly but it took me 5 minutes to do so. I need to find ways to save time, could you explain to me why you noted that "1) does not talk about x. Insufficient" ? It seems like you removed choice A quickly.

This is probably a terribly novice question but I'm a novice so, I hope you don't mind!

Cheers,
f

After manipulating the question stem (subtracting x on both sides) we are only left with y to determine...since Statement 1 gives x but says nothing about y, which is what we are looking for it is immediately insufficient
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Re: Is x-y+1 greater than x+y-1 ? [#permalink]

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01 Oct 2010, 10:06
Michmax3 wrote:

After manipulating the question stem (subtracting x on both sides) we are only left with y to determine...since Statement 1 gives x but says nothing about y, which is what we are looking for it is immediately insufficient

Ah, I see that now. I need to notice the significance of things like this more quickly. Thank you for the answer.
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Re: Is x-y+1 greater than x+y-1 ? [#permalink]

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30 Apr 2012, 09:48
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Is x-y+1 greater than x+y-1 ?

(1) x > 0
(2) y < 0
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Re: Is x-y+1 greater than x+y-1 ? [#permalink]

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30 Apr 2012, 09:58
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Is x-y+1 greater than x+y-1 ?

Is x-y+1>x+y-1? --> x's cancel out and we get: is 2>2y? --> is y<1?

(1) x > 0. Not sufficient.
(2) y < 0. The answer to the question is YES. Sufficient.

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Re: Is x-y+1 greater than x+y-1 ? [#permalink]

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01 Dec 2013, 07:28
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Re: Is x-y+1 greater than x+y-1 ? [#permalink]

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01 Sep 2014, 10:52
Hi Bunuel,

y<1 can also mean y=0 right.. how can we assume y<1 is equal to y<0?
please clarify if i am missing some point..
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Re: Is x-y+1 greater than x+y-1 ? [#permalink]

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01 Sep 2014, 10:55
Expert's post
janani28 wrote:
Hi Bunuel,

y<1 can also mean y=0 right.. how can we assume y<1 is equal to y<0?
please clarify if i am missing some point..

The question asks whether y is less than 1. The second statement says that y is a negative number, so it must be less than 1.

Does this make sense?
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Re: Is x-y+1 greater than x+y-1 ? [#permalink]

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01 Sep 2014, 10:58
yeah.. my bad...got the point ... thanks much
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Re: Is x-y+1 greater than x+y-1 ? [#permalink]

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10 Apr 2015, 01:08
Bunuel wrote:
Is x-y+1 greater than x+y-1 ?

Is x-y+1>x+y-1? --> x's cancel out and we get: is 2>2y? --> is y<1?

(1) x > 0. Not sufficient.
(2) y < 0. The answer to the question is YES. Sufficient.

Hi Bunuel,

Can we cancel out x in this inequality. we dont know whether x is positive or negative. pls help.

Thanks,
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Re: Is x-y+1 greater than x+y-1 ? [#permalink]

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10 Apr 2015, 01:12
CKG wrote:
Bunuel wrote:
Is x-y+1 greater than x+y-1 ?

Is x-y+1>x+y-1? --> x's cancel out and we get: is 2>2y? --> is y<1?

(1) x > 0. Not sufficient.
(2) y < 0. The answer to the question is YES. Sufficient.

Hi Bunuel,

Can we cancel out x in this inequality. we dont know whether x is positive or negative. pls help.

Thanks,

My Bad, Got confused. we can add or subtract anything form the inequalities and hence X cancels out !!
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Re: Is x-y+1 greater than x+y-1 ? [#permalink]

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27 Oct 2015, 07:43
Hello from the GMAT Club BumpBot!

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Re: Is x-y+1 greater than x+y-1 ? [#permalink]

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28 Oct 2015, 20:58
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Is x-y+1>x+y-1?

On rearranging the variables,
we get 2>2y? or simply y<1?

Hence our new question stem becomes: Is y less than 1?

Statement 1: x > 0. No information about y. NOT SUFFICIENT
Statement 2: y < 0. From this, we can safely say that y will be less than 1
SUFFICIENT

Option B
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Re: Is x-y+1 greater than x+y-1 ?   [#permalink] 28 Oct 2015, 20:58
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